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\begin{tabular}{lccc}
\hline \noalign{\smallskip} & (1) & (2) & (3)\\
\noalign{\smallskip}\hline \noalign{\smallskip} y & 0.4466 & 0.0318 & 0.0317\\
 & \begin{footnotesize}(0.0015)**\end{footnotesize} & \begin{footnotesize}(0.0061)**\end{footnotesize} & \begin{footnotesize}(0.0061)**\end{footnotesize}\\
\noalign{\smallskip} alpha & -0.0871 & -0.0863 & -0.0879\\
 & \begin{footnotesize}(0.0024)**\end{footnotesize} & \begin{footnotesize}(0.0024)**\end{footnotesize} & \begin{footnotesize}(0.0024)**\end{footnotesize}\\
\noalign{\smallskip} abst_1 & -0.1916 & -0.1862 & -0.1850\\
 & \begin{footnotesize}(0.0018)**\end{footnotesize} & \begin{footnotesize}(0.0017)**\end{footnotesize} & \begin{footnotesize}(0.0017)**\end{footnotesize}\\
\noalign{\smallskip} p & -0.6486 & -0.6483 & -0.6481\\
 & \begin{footnotesize}(0.0015)**\end{footnotesize} & \begin{footnotesize}(0.0015)**\end{footnotesize} & \begin{footnotesize}(0.0015)**\end{footnotesize}\\
\noalign{\smallskip} mu_1 & -0.0087 & -0.0075 & -0.0380\\
 & \begin{footnotesize}(0.0007)**\end{footnotesize} & \begin{footnotesize}(0.0007)**\end{footnotesize} & \begin{footnotesize}(0.0010)**\end{footnotesize}\\
\noalign{\smallskip} mu_2 & 0.0086 & 0.0074 & 0.0379\\
 & \begin{footnotesize}(0.0007)**\end{footnotesize} & \begin{footnotesize}(0.0007)**\end{footnotesize} & \begin{footnotesize}(0.0010)**\end{footnotesize}\\
\noalign{\smallskip} sigma_1 & -0.0082 & -0.0079 & -0.0388\\
 & \begin{footnotesize}(0.0011)**\end{footnotesize} & \begin{footnotesize}(0.0011)**\end{footnotesize} & \begin{footnotesize}(0.0013)**\end{footnotesize}\\
\noalign{\smallskip} sigma_2 & -0.0170 & -0.0162 & 0.0169\\
 & \begin{footnotesize}(0.0011)**\end{footnotesize} & \begin{footnotesize}(0.0011)**\end{footnotesize} & \begin{footnotesize}(0.0013)**\end{footnotesize}\\
\noalign{\smallskip} A & -0.0688 & -0.0689 & -0.0688\\
 & \begin{footnotesize}(0.0010)**\end{footnotesize} & \begin{footnotesize}(0.0010)**\end{footnotesize} & \begin{footnotesize}(0.0010)**\end{footnotesize}\\
\noalign{\smallskip} B & 0.0849 & 0.0846 & 0.0833\\
 & \begin{footnotesize}(0.0013)**\end{footnotesize} & \begin{footnotesize}(0.0013)**\end{footnotesize} & \begin{footnotesize}(0.0013)**\end{footnotesize}\\
\noalign{\smallskip}y2 &  & 0.4141 & 0.4144\\
 & \begin{footnotesize}\end{footnotesize} & \begin{footnotesize}(0.0059)**\end{footnotesize} & \begin{footnotesize}(0.0059)**\end{footnotesize}\\
\noalign{\smallskip}w_dif &  &  & -0.0473\\
 & \begin{footnotesize}\end{footnotesize} & \begin{footnotesize}\end{footnotesize} & \begin{footnotesize}(0.0010)**\end{footnotesize}\\
\noalign{\smallskip}Constant & 0.1434 & 0.2093 & 0.2310\\
 & \begin{footnotesize}(0.0048)**\end{footnotesize} & \begin{footnotesize}(0.0049)**\end{footnotesize} & \begin{footnotesize}(0.0049)**\end{footnotesize}\\
\noalign{\smallskip}$R^2$ & 0.39 & 0.40 & 0.40\\
$N$ & 445,787 & 445,787 & 445,787\\
\noalign{\smallskip}\hline\end{tabular}\\
\smallskip\begin{footnotesize}+ $p<0$.1; * $p<0$.05; ** $p<0$.01\end{footnotesize}\\
\smallskip
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